You have the OG Droid correct?
What ROM are you running if any?
What theme(s) are you trying to install?

There are a few different types of themes and each one is installed a different way.

If you are trying to install a theme that wasn't made for your phone/ROM, this can definitely cause issues.

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I apologize, I should have included a little more detail in my op. And to answer your questions I am running the og droid with factory rom as of now. I tried a few different roms but my temp always went up about 20-30 degrees so I went back to stock. Do you know what a good temp is for the droid? and what is too hot? right now mines temp is 26c/78f with the other roms it was running somewhere around 60/110.